diff --git a/manifest b/manifest
index 018db97054..9c330a0aad 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Merge\sthe\sParseCleanup\senhancement\sto\strunk.
-D 2021-01-12T16:26:36.110
+C Lexer\sand\sgrammar\srules\sfor\sa\sRETURNING\sclause\son\sDELETE/INSERT/UPDATE.\nActually\smaking\sthis\swork,\sthough,\swill\sinvolve\sa\slot\smore\scode\swhich\swill\nlikely\sslow\sdown\sprocessing\sfor\sthe\scommon\scase\swhere\sthere\sis\sno\nRETURNING\sclause.\s\sFurthermore,\sRETURNING\sseems\sto\sbe\sof\slimited\susefulness\nand\sit\sis\snot\sstandard\sSQL.\s\sSo\swe\sabandon\sit\shere.\s\sThese\sexperimental\nchanges\sare\sparked\sin\sa\sbranch\sas\san\shistorical\sreference.\s\sIf\scircumstances\nchanges,\swe\smight\stake\sup\sthe\scause\sagain\ssome\sday.
+D 2021-01-12T20:16:31.150
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -484,7 +484,7 @@ F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
 F src/btree.c 0f9cb686871ae668817673f0823b55d1bcadbc86ea28bd22c590b064a8322d5a
 F src/btree.h 285f8377aa1353185a32bf455faafa9ff9a0d40d074d60509534d14990c7829e
 F src/btreeInt.h 7614cae30f95b6aed0c7cac7718276a55cfe2c77058cbfd8bef5b75329757331
-F src/build.c d4c06261b0e532523ede58dc511381a7a9c155132e4b65a6bb2ff76fe657793a
+F src/build.c ba8af18891c07501a185ecd02a2bc13a593de9bfd59dbffa5d126780c0c9fb8e
 F src/callback.c d0b853dd413255d2e337b34545e54d888ea02f20da5ad0e63585b389624c4a6c
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c 2a322b9a3d75771fb4d99e0702851f4f68dda982507a0f798eefb0712969a410
@@ -529,7 +529,7 @@ F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 F src/pager.c c49952ac5e9cc536778eff528091d79d38b3e45cbeeed4695dc05e207dc6547d
 F src/pager.h 4bf9b3213a4b2bebbced5eaa8b219cf25d4a82f385d093cd64b7e93e5285f66f
-F src/parse.y 6c8aa09a7fa6e0867c3a3d67ef61b911aa392c9b084a61dc632cd93732aef8ad
+F src/parse.y 6b462c25bae7e0c53f2935f9157f82abeba07754905ef8835c978742c5473ff3
 F src/pcache.c 385ff064bca69789d199a98e2169445dc16e4291fa807babd61d4890c3b34177
 F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
 F src/pcache1.c 6596e10baf3d8f84cc1585d226cf1ab26564a5f5caf85a15757a281ff977d51a
@@ -545,7 +545,7 @@ F src/shell.c.in 79bceb990e4bac23a09bb8dd65783ea4867b8bfca9242b5a82b884043e65109
 F src/sqlite.h.in 0af968a1fa3c717261e1df0ed105fa7bddb4d82de7e0adb3eab49e6aa81b4de7
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 61b38c073d5e1e96a3d45271b257aef27d0d13da2bea5347692ae579475cd95e
-F src/sqliteInt.h c7c7e0e79769885a1c7fa519299bdb222e83e2d7d4843ed6ca1cd9a585016386
+F src/sqliteInt.h de0ba6b4f9bcddd665b4aa8feead3108e737536f061bad85992ffbad8050239f
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 4b8bc2a6905163a38b739854a35b826c737333fab5b1f8e03fa7eb9a4799c4c1
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@ -1823,7 +1823,7 @@ F tool/max-limits.c cbb635fbb37ae4d05f240bfb5b5270bb63c54439
 F tool/mkautoconfamal.sh f62353eb6c06ab264da027fd4507d09914433dbdcab9cb011cdc18016f1ab3b8
 F tool/mkccode.tcl 86463e68ce9c15d3041610fedd285ce32a5cf7a58fc88b3202b8b76837650dbe x
 F tool/mkctimec.tcl dd183b73ae1c28249669741c250525f0407e579a70482371668fd5f130d9feb3
-F tool/mkkeywordhash.c 24e4396ae665d985fed9e040e8b748129c1a12d77eeeae7ad4609821c41ba7bf
+F tool/mkkeywordhash.c 750f25aef0e23f8e3367af6d824fbf5ed7d3e285f27cea91aa2dd72c367630eb
 F tool/mkmsvcmin.tcl 6ecab9fe22c2c8de4d82d4c46797bda3d2deac8e763885f5a38d0c44a895ab33
 F tool/mkopcodec.tcl d1b6362bd3aa80d5520d4d6f3765badf01f6c43c
 F tool/mkopcodeh.tcl 352a4319c0ad869eb26442bf7c3b015aa15594c21f1cce5a6420dbe999367c21
@@ -1895,8 +1895,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 8f3ab5da4c8906b63e2c1a0021a3ba4f60e7199e8640518060f998876a002663 38ef8ab9830e12acd2c710e113939b1f8dced02612c6933c37a3c948a4030d0a
-R a2b97b3e175b432108521b3e9366ef42
-T +closed 38ef8ab9830e12acd2c710e113939b1f8dced02612c6933c37a3c948a4030d0a
+P 35824c1bcbd89ae4a94acfbe511bfbd888c418b981819e72bc9a991fc82d136c
+R f88ede067372ddc1781e1314bfb966d4
+T *branch * returning
+T *sym-returning *
+T -sym-trunk *
 U drh
-Z 9c0d514193cce7631d3a6adc01edb18c
+Z a56a87fefbb361b1248407b671a1766d
diff --git a/manifest.uuid b/manifest.uuid
index 730c7d084c..1bce0b6baa 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-35824c1bcbd89ae4a94acfbe511bfbd888c418b981819e72bc9a991fc82d136c
\ No newline at end of file
+abf8da815646055df5b871d54b99994c1470182dee7952fc5fd627e4379406cb
\ No newline at end of file
diff --git a/src/build.c b/src/build.c
index 50289c6a1d..5b4bbe499b 100644
--- a/src/build.c
+++ b/src/build.c
@@ -1243,6 +1243,14 @@ void sqlite3ColumnPropertiesFromName(Table *pTab, Column *pCol){
 }
 #endif
 
+/*
+** Add the RETURNING clause to the parser currently underway.
+*/
+void sqlite3AddReturning(Parse *pParse, ExprList *pList){
+  sqlite3ParserAddCleanup(pParse,
+     (void(*)(sqlite3*,void*))sqlite3ExprListDelete, pList);
+  pParse->pReturning = pList;
+}
 
 /*
 ** Add a new column to the table currently being constructed.
diff --git a/src/parse.y b/src/parse.y
index faec4b5cf5..4c79d4a87a 100644
--- a/src/parse.y
+++ b/src/parse.y
@@ -868,7 +868,7 @@ limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y).
 /////////////////////////// The DELETE statement /////////////////////////////
 //
 %if SQLITE_ENABLE_UPDATE_DELETE_LIMIT || SQLITE_UDL_CAPABLE_PARSER
-cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt(W) 
+cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt_ret(W)
         orderby_opt(O) limit_opt(L). {
   sqlite3SrcListIndexedBy(pParse, X, &I);
 #ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
@@ -881,7 +881,7 @@ cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt(W)
   sqlite3DeleteFrom(pParse,X,W,O,L);
 }
 %else
-cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt(W). {
+cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt_ret(W). {
   sqlite3SrcListIndexedBy(pParse, X, &I);
   sqlite3DeleteFrom(pParse,X,W,0,0);
 }
@@ -889,9 +889,17 @@ cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt(W). {
 
 %type where_opt {Expr*}
 %destructor where_opt {sqlite3ExprDelete(pParse->db, $$);}
+%type where_opt_ret {Expr*}
+%destructor where_opt_ret {sqlite3ExprDelete(pParse->db, $$);}
 
 where_opt(A) ::= .                    {A = 0;}
 where_opt(A) ::= WHERE expr(X).       {A = X;}
+where_opt_ret(A) ::= .                                      {A = 0;}
+where_opt_ret(A) ::= WHERE expr(X).                         {A = X;}
+where_opt_ret(A) ::= RETURNING selcollist(X).               
+       {sqlite3AddReturning(pParse,X); A = 0;}
+where_opt_ret(A) ::= WHERE expr(X) RETURNING selcollist(Y).
+       {sqlite3AddReturning(pParse,Y); A = X;}
 
 ////////////////////////// The UPDATE command ////////////////////////////////
 //
@@ -946,7 +954,7 @@ cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) select(S)
         upsert(U). {
   sqlite3Insert(pParse, X, S, F, R, U);
 }
-cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) DEFAULT VALUES.
+cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) DEFAULT VALUES returning.
 {
   sqlite3Insert(pParse, X, 0, F, R, 0);
 }
@@ -959,16 +967,20 @@ cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) DEFAULT VALUES.
 // avoid unreachable code.
 //%destructor upsert {sqlite3UpsertDelete(pParse->db,$$);}
 upsert(A) ::= . { A = 0; }
+upsert(A) ::= RETURNING selcollist(X).  { A = 0; sqlite3AddReturning(pParse,X); }
 upsert(A) ::= ON CONFLICT LP sortlist(T) RP where_opt(TW)
               DO UPDATE SET setlist(Z) where_opt(W) upsert(N).
               { A = sqlite3UpsertNew(pParse->db,T,TW,Z,W,N);}
 upsert(A) ::= ON CONFLICT LP sortlist(T) RP where_opt(TW) DO NOTHING upsert(N).
               { A = sqlite3UpsertNew(pParse->db,T,TW,0,0,N); }
-upsert(A) ::= ON CONFLICT DO NOTHING.
+upsert(A) ::= ON CONFLICT DO NOTHING returning.
               { A = sqlite3UpsertNew(pParse->db,0,0,0,0,0); }
-upsert(A) ::= ON CONFLICT DO UPDATE SET setlist(Z) where_opt(W).
+upsert(A) ::= ON CONFLICT DO UPDATE SET setlist(Z) where_opt(W) returning.
               { A = sqlite3UpsertNew(pParse->db,0,0,Z,W,0);}
 
+returning ::= RETURNING selcollist(X).  {sqlite3AddReturning(pParse,X);}
+returning ::= .
+
 %type insert_cmd {int}
 insert_cmd(A) ::= INSERT orconf(R).   {A = R;}
 insert_cmd(A) ::= REPLACE.            {A = OE_Replace;}
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 6d1e598d94..c7dd11862f 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -3405,6 +3405,7 @@ struct Parse {
   int nLabelAlloc;     /* Number of slots in aLabel */
   int *aLabel;         /* Space to hold the labels */
   ExprList *pConstExpr;/* Constant expressions */
+  ExprList *pReturning;/* The RETURNING clause, if any */
   Token constraintName;/* Name of the constraint currently being parsed */
   yDbMask writeMask;   /* Start a write transaction on these databases */
   yDbMask cookieMask;  /* Bitmask of schema verified databases */
@@ -4248,6 +4249,7 @@ void sqlite3AddDefaultValue(Parse*,Expr*,const char*,const char*);
 void sqlite3AddCollateType(Parse*, Token*);
 void sqlite3AddGenerated(Parse*,Expr*,Token*);
 void sqlite3EndTable(Parse*,Token*,Token*,u8,Select*);
+void sqlite3AddReturning(Parse*,ExprList*);
 int sqlite3ParseUri(const char*,const char*,unsigned int*,
                     sqlite3_vfs**,char**,char **);
 #define sqlite3CodecQueryParameters(A,B,C) 0
diff --git a/tool/mkkeywordhash.c b/tool/mkkeywordhash.c
index f8537a85bd..ea3763fd19 100644
--- a/tool/mkkeywordhash.c
+++ b/tool/mkkeywordhash.c
@@ -155,10 +155,16 @@ struct Keyword {
 #  define WINDOWFUNC 0x00100000
 #endif
 #ifdef SQLITE_OMIT_GENERATED_COLUMNS
-#  define GENCOL 0
+#  define GENCOL     0
 #else
-#  define GENCOL 0x00200000
+#  define GENCOL     0x00200000
 #endif
+#ifdef SQLITE_OMIT_RETURNING
+#  define RETURNING  0
+#else
+#  define RETURNING  0x00400000
+#endif
+
 
 /*
 ** These are the keywords
@@ -280,6 +286,7 @@ static Keyword aKeywordTable[] = {
   { "RENAME",           "TK_RENAME",       ALTER,            1      },
   { "REPLACE",          "TK_REPLACE",      CONFLICT,         10     },
   { "RESTRICT",         "TK_RESTRICT",     FKEY,             1      },
+  { "RETURNING",        "TK_RETURNING",    RETURNING,        10     },
   { "RIGHT",            "TK_JOIN_KW",      ALWAYS,           0      },
   { "ROLLBACK",         "TK_ROLLBACK",     ALWAYS,           1      },
   { "ROW",              "TK_ROW",          TRIGGER,          1      },